last update : june 13, 2011
I noticed that a layer with an embedded webpage as an object is not covered by an other layer having a higher z-index in Internet Explorer, whereas it is correctly displayed in Firefox. The same problem has been reported in the webmasterworld forum. I found a workaround (see www.artgallery.lu/expositions/expo_samuel_martin.html) to integrate the text from the second layer in the embedded webpage, but this works only without links.
Another tough nut to crack for developers is the z-index working with Flash, because the Flash Player always writes the SWF on the topmost layer of the page, regardless of z-index order. It works with swfobject if the parameter wmode is set to opaque (see an example on the website of Leslie’s Artgallery).
A demopage showing how z-index works is available at the tjkdesign.com website.